cryoto: drbg - clear all temporary memory
The buffer uses for temporary data must be cleared entirely. In AES192
the used buffer is drbg_statelen(drbg) + drbg_blocklen(drbg) as
documented in the comment above drbg_ctr_df.
This patch ensures that the temp buffer is completely wiped.
Signed-off-by: Stephan Mueller <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
diff --git a/crypto/drbg.c b/crypto/drbg.c
index b69409c..8d2944f 100644
--- a/crypto/drbg.c
+++ b/crypto/drbg.c
@@ -487,7 +487,7 @@
out:
memset(iv, 0, drbg_blocklen(drbg));
- memset(temp, 0, drbg_statelen(drbg));
+ memset(temp, 0, drbg_statelen(drbg) + drbg_blocklen(drbg));
memset(pad, 0, drbg_blocklen(drbg));
return ret;
}
